___________ provide a form of adaptive immunity

Which of the following statements regarding blisters and calluses is true?

A. It is beyond the scope of practice for physical therapists to debride calluses but not blisters. B. Blisters require debridement but calluses should not be debrided. C. Blisters and calluses should be debrided. D. Calluses require debridement but blisters should not be debrided.

Which of the following are criteria for the design of a reference cell for pH/blood gas analysis? I. Reaction is reversible. II. Reaction is stable. III. Reaction is reproducible

A) I B) I and II C) II and III D) I, II, and III